noun plural but singular or plural in constructionDate: circa 1903
a common American marsh and shore bird (Tringa flavipes) that closely resembles the greater yellowlegs in color and markings but is smaller with a shorter more slender bill

yellowlegs — ☆ yellowlegs [yel′ō legz΄] n. pl. yellowlegs either of two large, gray and white sandpipers, the greater yellowlegs ( Tringa melanoleuca) or the lesser yellowlegs ( T. flavipes), having long, yellow legs, found in North and South America … English World dictionary